多煤层开采导水裂隙带发育与覆岩破坏高度规律  

On Development Law of Water Conducting Fracture Zone and Overburden Failure Height in Multi-Coal Seam Mining

作　　者：魏世荣 赵延林[3] 戚春前 唐世斌[5] WEI Shirong;ZHAO Yanlin;QI Chunqian;TANG Shibin(Guoneng Shendong Coal Group Co.,Ltd.,Shenmu 719300,China;State Key Laboratory of Water Resources Protection and Utilization of Coal Mining,National Energy Group,Beijing 102209;Hunan Provincal Key Laboratory of Coal Mine Safety Technique,Hunan University of Science and Technology,Xiangtan 411201,China;Wuhai Energy Company,National Energy Group,Wuhai 016000,China;Dalian University of Technology,School of Civil Engineering,Dalian 116024,China)

机构地区：[1]国能神东煤炭集团有限责任公司,陕西神木719300 [2]国家能源集团煤炭开采水资源保护与利用国家重点实验室,北京102209 [3]湖南科技大学煤矿安全开采技术湖南省重点实验室,湖南湘潭411201 [4]国家能源集团乌海能源有限责任公司,内蒙古乌海016000 [5]大连理工大学土木工程学院,辽宁大连116024

出　　处：《湖南科技大学学报（自然科学版）》2022年第2期18-26,共9页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：国家自然科学基金资助项目(52004285)。

摘　　要：为了进一步揭示多煤层开采过程中,采动裂隙带发育规律的影响因素与采空区水的变化特性,以公乌素煤矿为研究对象,分别研究了该矿区煤层的覆岩类型及其对覆岩破裂的影响,从理论和数值模拟的角度研究了多煤层开采对覆岩破坏高度的影响.研究结果表明:(1)煤层覆岩越坚硬,覆岩破裂带发育的高度较大,导水裂隙发育就越高,反之,则容易下沉,但不易产生开裂,最终表现为覆岩破坏高度降低;(2)煤层采动过程中,开采厚度、开采方法、工作面跨度、开采深度与导水裂隙带的高度变化呈正相关关系;(3)公乌素煤矿倾斜煤层回采的导水裂隙带的分布沿工作面的倾斜方向整体呈不对称“马鞍形”破坏特征,多煤层下行开采过程中,下部煤层开采可以有效地减小上覆岩层采动引起的应力集中现象,且采空区的卸压范围及高度也随之增加.相关研究成果可为同类型矿井安全开采提供参考依据.In order to reveal the influencing factors of the development law of mining fracture zone and the variation characteristics of goaf water in the multi-coal seam mining,taking Gongwusu Coal Mine as the research object,the classification of coal seam overburden types and its influence on overburden fracture in Gongwusu Coal Mine are studied respectively.The influence of multi-seam mining on the failure height of overburden is studied from the perspective of theory and numerical simulation.The results show that(1)the harder the coal seam overburden is,the higher the development height of overburden fracture zone is,and the higher the development of water diversion fracture is.On the contrary,it is easy to sink but not easy to crack,and finally the height of overburden failure is reduced;(2)Mining thickness,mining method,working face span and mining depth are positively correlated with the height of water diversion fracture zone in the coal seam mining;(3)The distribution of water conducting fracture zone in inclined coal seam mining of Gongwusu Coal Mine is asymmetric“saddle shaped”failure characteristics along the inclined direction of the working face.In the multi-coal seam downward mining,the mining of lower coal seam can effectively reduce the stress concentration caused by mining of overlying strata,and the pressure relief range and height of goaf also increase.The relevant research results provide a referential basis for the safe mining of the same type of mines.

关 键 词：多煤层开采 导水裂隙带 覆岩破裂 数值模拟 

分 类 号：TD325[矿业工程—矿井建设]